N-acylated methionine sulfoxides as food flavouring compounds

ABSTRACT

A flavour composition comprising a compound of formula (I) and edible salts thereof, wherein R 1  is an alkyl residue containing 2 to 18 carbon atoms, or an alkene residue containing from 9 to 25 carbon atoms with 1 to 6 double bonds, R 1  together with the carbonyl group to which it is attached is a residue of a carboxylic acid.

The present application is a continuation of co-pending U.S. Ser. No. 14/870,598, filed Sep. 30, 2015, now U.S. Pat. No. 10,385,015 from which priority is claimed.

The present disclosure is concerned with certain carboxylic acid-amino acid conjugates, flavour compositions containing said conjugates, and their use in edible compositions.

Many food flavour ingredients are known in the art that exert their own very pronounced flavour characteristics to a food product. Such ingredients may be of great value in niche areas for particular types of food categories, but can be incongruous, or even offensive, when employed in other food categories.

There is a need to provide broad spectrum flavour ingredients that act to complement or accentuate the taste and mouthfeel characteristics of the edible compositions into which they are incorporated.

The applicant has now found that a methionine sulfoxide connected to a fatty acid residue through an amide bond may be employed as flavour ingredients that complement or accentuate the taste and mouthfeel characteristics of edible compositions into which they are incorporated across a wide category of flavour applications.

The present disclosure provides in a first aspect compounds of formula (I)

their edible salts, and their use in edible compositions wherein R₁ is an alkyl residue containing 2 to 18 carbon atoms, or an alkene residue containing from 9 to 25 carbon atoms with 1 to 6 double bonds, R₁ together with the carbonyl group to which it is attached is a residue of a carboxylic acid.

Edible salts include those typically employed in the food and beverage industry and include chlorides, sulphates, phosphates, gluconates, sodium, citrates, carbonates, acetates and lactates.

The carboxylic acids may be represented by abbreviations. Henceforth, the carboxylic acid residues may be referred to by the abbreviation Cn, wherein “n” represents the number of carbon atoms in the residue. For example, the residue of an 18 carbon acid may be abbreviated as C18. Still further, if the 18 carbon acid is saturated, e.g. stearic acid. It may be abbreviated as C18:0 (because it contains zero double bonds), whereas an 18 carbon acid having one double bond—e.g. oleic acid—may be abbreviated as C18:1. Still further, if the C18 acid has a single double bond in the cis configuration, then it can be abbreviated as C18:1c. Similarly, if the double bond was in the trans configuration, then the abbreviation becomes C18:1t.

In a particular embodiment of the present disclosure the carboxylic acid residue is a residue of a fatty acid.

The fatty acid residue may be the residue of a C2 to C18 fatty acid. The fatty acid may be mammalian or non-mammalian. A mammalian fatty acid is a natural or synthetic fatty acid that is identical in structure to one naturally produced in a mammal, including, but not limited to, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, eicosatrienoic acid, arachidonic acid, eicosapentenoic acid, and docosatetraenoic acid. A non-mammalian fatty acid is a natural or synthetic fatty acid not normally produced by a mammal, including, but not limited to, pentadecanoic acid; heptadecanoic acid; nonadecanoic acid; heneicosanoic acid; 9-trans-tetradecenoic acid; 10-trans-pentadecenoic acid; 9-trans-hexadecenoic acid; 10-trans-heptadecenoic acid; 10-trans-heptadecenoic acid; 7-trans-nonadecenoic acid; 10,13-nonadecadienoic acid; 11-trans-eicosenoic acid; and 12-transhenicosenoic acid.

The fatty acid residues may be saturated or unsaturated. In one embodiment, if they are unsaturated, they have 1, 2 or 3 double bonds, which may be in cis- or trans-configuration.

In another embodiment, the fatty acid residues may be C16 to C18, and may be saturated or unsaturated.

The skilled person will appreciate, however, that natural sources of these fatty acids, for example almond oil, avocado oil, castor oil, coconut oil, corn oil, cottonseed oil, olive oil, peanut oil, rice bran oil, safflower oil, sesame oil, soybean oil, sunflower oil, palm oil and canola oil, each consist of a complex mixture of fatty acids. For example, safflower oil is predominately a source of the C18:2 linoleic acid, nevertheless it may contain other fatty acids, such as linolenic acid (C18:3) and palmitic acid (C16:0), amongst others. Accordingly, reference herein to a compound containing a particular fatty acid residue, for example a residue of C18 fatty acid, may be a reference to a pure, or substantially pure C18 fatty acid residue, or it may relate to a mixture of fatty acid residues with the predominant residue being a C18 residue. In one embodiment, fatty acid residues are C16 to C18.

The sulfoxide compounds of formula (I) can also be represented using these abbreviations. For example, the compound of formula (I) consisting of a residue of a C18 carboxylic acid and a Methionine sulfoxide (Met-SO) can be represented by the abbreviation C18-Met-SO. For simplicity the compounds of formula (I) henceforth may be represented in this abbreviated form.

As is evident from the above formula (I), the amino nitrogen atom on the amino acid residue is bound to a carbonyl carbon atom of the carboxylic acid residue to form an amide linkage. Thus, the abbreviated form C18-Met-SO represents the compound of formula (I) in which the Methionine sulfoxide is connected via its nitrogen atom to the carbonyl carbon atom of a C18 carboxylic acid.

The compounds include C2-Met-SO, C6-Met-SO, C10-Met-SO, C12-Met-SO, C14-Met-SO, C15-Met-SO, C16-Met-SO, C17-Met-SO and C18-Met-SO.

The compounds include C2-Met-SO, C6-Met-SO, C10-Met-SO, C12-Met-SO, C14-Met-SO, C15-Met-SO, C16-Met-SO, C17-Met-SO and C18-Met-SO, wherein the carboxylic acid residue is saturated.

The compounds include C2-Met-SO, C6-Met-SO, C10-Met-SO, C12-Met-SO, C14-Met-SO, C15-Met-SO, C16-Met-SO, C17-Met-SO and C18-Met-SO wherein the carboxylic acid residue is unsaturated and contains 1, 2 or 3 double bonds. The double bonds may be in cis-configuration, trans-configuration or a mixture of cis- and trans-configuration.

In one embodiment, the compounds bearing the Met-SO residue include N-geranoyl-Met, N-palmitoyl-Met, N-palmitenoyl-Met, N-stearoyl-Met, N-linoleoyl-Met and N-linolenoyl-Met.

In one embodiment, sulfoxide compounds of formula (I) are selected from the group consisting of (2S)-2-acetamido-4-(methylsulfinyl)butanoic acid; (2S)-2-hexanamido-4-(methylsulfinyl)butanoic acid; (2S)-2-decanamido-4-(methylsulfinyl)butanoic acid; (2S)-2-((Z)-dodec-5-enamido)-4-(methylsulfinyl)butanoic acid; (2S)-2-dodecanamido-4-(methylsulfinyl)butanoic acid; (2S)-4-(methylsulfinyl)-2-tetradecanamidobutanoic acid; (2S)-4-(methylsulfinyl)-2-pentadecanamidobutanoic acid; (2S)-4-(methylsulfinyl)-2-palmitamidobutanoic acid; (2S)-2-heptadecanamido-4-(methylsulfinyl)butanoic acid; (2S)-4-(methylsulfinyl)-2-((9Z,12Z)-octadeca-9,12-dienamido)butanoic acid; (2S)-4-(methylsulfinyl)-2-oleamidobutanoic acid; and (2S)-4-(methylsulfinyl)-2-stearamidobutanoic acid.

The sulfoxide compounds of formula (I) can be formed by known methods using commercially available starting materials, reagents and solvents, and a detailed discussion is not warranted here. In one embodiment, the conjugates can be formed by the reaction of an amino acid with a fatty acid halide, e.g. a chloride under basic conditions in aqueous conditions such as a water/THF solvent system. Yield and reaction times may be improved by applying heat to the reaction mixture.

In yet another embodiment, an amino acid alkyl ester may be reacted with a fatty acid chloride under basic conditions in an aqueous-based solvent, such as a water/THF solvent system. Thereafter, the ester can be hydrolysed carefully without affecting the amide bond in basic methanol water solution

In yet another embodiment, a fatty acid and an amino acid alkyl ester can be reacted in dioxane in the presence of DCC (dicyclohexylcarbodiimide) and 1-hydroxypyrrolidine-2,5-dione. The ester can be hydrolysed carefully without affecting the amide bond in dilute basic methanol water solution

In yet another embodiment, a (mixed) anhydride of a fatty acid is reacted with an amino acid in dioxane.

In yet another embodiment, a fatty acid alkyl ester can be reacted with an amino acid in dioxane

In still another embodiment, an amino acid alkyl ester is reacted with a triglyceride, optionally in the presence of a co-solvent. The amino acid ester thus formed is then hydrolysed according to a method described above.

In yet another embodiment, an amino acid is reacted with a triglyceride, optionally in the presence of a co-solvent.

In yet another embodiment, an amino acid is reacted with a triglyceride in the presence of a lipase, esterase, peptidase, amidase or acylase, optionally in the presence of a cosolvent and/or water.

In yet another embodiment a fatty acid alkyl ester is reacted with an amino acid in the presence of a lipase or an acylase, optionally in the presence of a co-solvent and/or water.

The sulfoxide compounds of formula (I) impart remarkable organoleptic properties to edible compositions to which they are added. In particular, they impart highly intense, authentic and harmonious flavour, and a roundness and fullness to edible compositions containing them.

More particularly, the compounds can be incorporated into an edible product to impart a remarkable mouthfeel, body and enhanced fat perception; or an enhanced umami or salt taste. They are particularly useful in applications low in fat, salt and umami.

This finding was all the more surprising considering that when applicant tasted the compounds in dilute aqueous solution, they were either tasteless or they exhibited a disappointing, faintly fatty taste profile. As such, they appeared to be quite unsuitable for use in flavour applications. Only their combination with flavour co-ingredients and the judicious selection of their usage levels was it possible to discover the remarkable organoleptic properties of these compounds. Their effect on edible compositions is quite unusual in that rather than exerting a characteristic flavour profile to a foodstuff or a beverage, they actually complement, lift or accentuate the essential or authentic flavour and mouth feel characteristics of the foods or beverages in which they are incorporated. Accordingly, the compounds of the present disclosure find utility in a broad spectrum of applications in the food and beverage industry, as well as in health and wellness.

Accordingly, in one embodiment, a method of conferring flavour and/or mouthfeel to, or improving taste and/or mouthfeel of an edible composition, which method comprises adding to said composition a sulfoxide compound of formula (I) defined herein.

The remarkable organoleptic effects are observed when the sulfoxide compounds of formula (I) are incorporated into an edible composition containing one or more flavour co-ingredients.

The flavour co-ingredients may be sugars, fats, salt (e.g. sodium chloride), MSG, calcium ions, phosphate ions, organic acids, proteins, purines and mixtures thereof.

In a particular embodiment, sugars are present in amounts of 0.001% to 90%, more particularly 0.001% to 50%, still more particularly 0.001% to 20% based on the total weight of an edible composition.

In a particular embodiment, fats are present in amounts of 0.001% to 100%, more particularly 0.001% to 80%, more particularly 0.001% to 30%, still more particularly 0.001% to 5% based on the total weight of an edible composition.

In a particular embodiment, salt (e.g. sodium chloride) is present in amounts of 0.001% to 20%, more particularly 0.001% to 5% based on the total weight of an edible composition.

In a particular embodiment, MSG is present in amounts of 0.001% to 2% based on the total weight of an edible composition.

In a particular embodiment, calcium is present in amounts of 0.001% to 50% more particularly 0.001% to 20%, still more particularly 0.001% to 1% based on the total weight of an edible composition.

In a particular embodiment, organic acids are present in amounts of 0.001% to 10%, more particularly 0.001% to 7% based on the total weight of an edible composition.

Types of organic acids include citric, malic, tartaric, fumaric, lactic, acetic, succinic. Types of edible compositions containing organic acids include beverages, such as carbonated soft drink beverages, still beverages, juices, powdered soft drinks, liquid concentrates, alcoholic beverages and functional beverages.

In a particular embodiment, phosphorus is present in an amount up to 0.5% by weight of an edible composition. Typically phosphorus is present as a phosphate or phosphoric acid.

In a particular embodiment, purines are present in an amount up to 0.5% by weight of an edible composition. The term “purines” include ribonucleotides such as IMP and GMP.

Despite their interesting organoleptic properties, nevertheless, applicant found that formulating the sulfoxide compounds of formula (I) was not a trivial matter. The discovered potency of the compounds suggested that they could be employed at very low levels in flavour applications, and so for ease of handling, mixing and processing with other ingredients, although it is possible to use the compounds in neat form, it is desirable to extend or add volume to the physical form of the compounds by incorporating them into a suitable vehicle, for example a diluent, such as a solvent. However, the compounds are solids or viscous oils at ambient temperatures, and have very limited solubility in water. Applicant found that an at least about 0.01% stock solution, more particularly about 0.01-1% stock solution of a sulfoxide compound of formula (I) achieved a balance regarding acceptable solvent levels for ease of handling and mixing, and the desire to limit the amount of solvent that would have to be removed from the stock solution when further processing of the compounds in flavour compositions and edible products for reasons of palatability, efficiency, cost and the like. Applicant found that suitable solvents for the stock solution include ethanol, triacetine, glycerol and miglyol.

In order to aid in the process of solubilization and produce a stock solution and minimize the amount of solvent, sulfoxide compounds of the formula (I) formed from a mixture of carboxylic acids, rather than a pure carboxylic acid may be used.

Accordingly, there is provided in another aspect of the present disclosure an at least about 0.01% stock solution, more particularly about 0.01-1% stock solution of a sulfoxide compound of formula (I).

The stock solution may contain other materials such as carrier materials and/or adjuvants more fully described below. In a particular embodiment, the stock solution contains an anti-oxidant selected from the group consisting of vitamin C, vitamin E, rosemary extract, antrancine, butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT). Anti-oxidants are preferably employed to prevent, or significantly reduce, generation of volatile off notes as a result of degradation of the compounds of formula (I). In one example, anti-oxidants are used when the compounds of formula (I) bear a residue of an unsaturated fatty acid. In another embodiment, anti-oxidants are used if the fatty acid residue contains more than 1 double bond. Determination of an effective amount of anti-oxidant is within the purview of the skilled person, however amounts in the range of about 10 ppm to 1000 ppm based on the weight of the stock solution may be present.

In preparing the flavour compositions in accordance with the present disclosure, the sulfoxide compounds of formula (I) may be employed in any physical form. They may be used in neat form, in the form of a stock solution described above; they may be used in the form of an emulsion; or they may be used in a powder form. If the sulfoxide compounds of formula (I) are presented in the form of a powder, the powder form can be produced by a dispersive evaporation process, such as a spray drying process as is more fully described below. The powder form may be prepared by subjecting a liquid formulation containing a sulfoxide compound of formula (I) to a dispersive evaporation process. The liquid formulation may comprise a solution, suspension or emulsion comprising the sulfoxide compound of formula (I). In particular, the liquid formulation may take the form of the stock solution described hereinabove. The liquid formulation may contain other ingredients such as a carrier material and/or an adjuvant as described more fully below.

A powder comprising a sulfoxide compound of formula (I) forms another aspect of the present disclosure.

The sulfoxide compounds of formula (I) may in incorporated into an edible composition alone, or in the form of a flavour composition comprising one or more flavour co-ingredients.

A flavour composition comprising a sulfoxide compound according to the formula (I) forms another aspect of the present disclosure.

In an embodiment, the flavour formulation comprises a sulfoxide compound of formula (I) and at least flavour co-ingredient.

In a particular embodiment, the flavour composition comprises:

-   -   i) a sulfoxide compound according to formula (I);     -   ii) at least one flavour co-ingredient;     -   iii) optionally a carrier material; and     -   iv) optionally at least one adjuvant.

By the term “flavour co-ingredient” is an ingredient that is able to contribute or impart or modify in a positive or pleasant way the taste of an edible composition.

All manner of flavour co-ingredients may be employed in a composition according to the present disclosure, including, but not limited to, natural flavours, artificial flavours, spices, seasonings, and the like. Flavour co-ingredients include synthetic flavour oils and flavouring aromatics and/or oils, oleoresins, essences, distillates, and extracts derived from plants, leaves, flowers, fruits, and so forth, and combinations comprising at least one of the foregoing.

Flavour oils include spearmint oil, cinnamon oil, oil of wintergreen (methyl salicylate), peppermint oil, Japanese mint oil, clove oil, bay oil, anise oil, eucalyptus oil, thyme oil, cedar leaf oil, oil of nutmeg, allspice, oil of sage, mace, oil of bitter almonds, and cassia oil; useful flavouring agents include artificial, natural and synthetic fruit flavours such as vanilla, and citrus oils including lemon, orange, lime, grapefruit, yazu, sudachi, and fruit essences including apple, pear, peach, grape, blueberry, strawberry, raspberry, cherry, plum, prune, raisin, cola, guarana, neroli, pineapple, apricot, banana, melon, apricot, ume, cherry, raspberry, blackberry, tropical fruit, mango, mangosteen, pomegranate, papaya and the like.

Additional exemplary flavours imparted by a flavouring agent include a milk flavour, a butter flavour, a cheese flavour, a cream flavour, and a yogurt flavour; a vanilla flavour; tea or coffee flavours, such as a green tea flavour, an oolong tea flavour, a tea flavour, a cocoa flavour, a chocolate flavour, and a coffee flavour; mint flavours, such as a peppermint flavour, a spearmint flavour, and a Japanese mint flavour; spicy flavours, such as an asafetida flavour, an ajowan flavour, an anise flavour, an angelica flavour, a fennel flavour, an allspice flavour, a cinnamon flavour, a chamomile flavour, a mustard flavour, a cardamom flavour, a caraway flavour, a cumin flavour, a clove flavour, a pepper flavour, a coriander flavour, a sassafras flavour, a savoury flavour, a Zanthoxyli Fructus flavour, a perilla flavour, a juniper berry flavour, a ginger flavour, a star anise flavour, a horseradish flavour, a thyme flavour, a tarragon flavour, a dill flavour, a capsicum flavour, a nutmeg flavour, a basil flavour, a marjoram flavour, a rosemary flavour, a bayleaf flavour, and a wasabi (Japanese horseradish) flavour; a nut flavour such as an almond flavour, a hazelnut flavour, a macadamia nut flavour, a peanut flavour, a pecan flavour, a pistachio flavour, and a walnut flavour; alcoholic flavours, such as a wine flavour, a whisky flavour, a brandy flavour, a rum flavour, a gin flavour, and a liqueur flavour; floral flavours; and vegetable flavours, such as an onion flavour, a garlic flavour, a cabbage flavour, a carrot flavour, a celery flavour, mushroom flavour, and a tomato flavour.

In some embodiments, said flavour co-ingredients include aldehydes and esters such as cinnamyl acetate, cinnamaldehyde, citral diethylacetal, dihydrocarvyl acetate, eugenyl 49 formate, p-methylamisol, and so forth can be used. Further examples of aldehyde flavourings include acetaldehyde (apple), benzaldehyde (cherry, almond), anisic aldehyde (licorice, anise), cinnamic aldehyde (cinnamon), citral, i.e., alpha-citral (lemon, lime), neral, i.e., beta-citral (lemon, lime), decanal (orange, lemon), ethyl vanillin (vanilla, cream), heliotrope, i.e., piperonal (vanilla, cream), vanillin (vanilla, cream), alpha-amyl cinnamaldehyde (spicy fruity flavours), butyraldehyde (butter, cheese), valeraldehyde (butter, cheese), citronellal (modifies, many types), decanal (citrus fruits), aldehyde C-8 (citrus fruits), aldehyde C-9 (citrus fruits), aldehyde C-12 (citrus fruits), 2-ethyl butyraldehyde (berry fruits), hexenal, i.e., trans-2 (berry fruits), tolyl aldehyde (cherry, almond), veratraldehyde (vanilla), 2,6-dimethyl-5-heptenal, i.e., melonal (melon), 2,6-dimethyloctanal (green fruit), and 2-dodecenal (citrus, mandarin), and the like.

Further examples of other flavour co-ingredients can be found in “Chemicals Used in Food Processing”, publication 1274, pages 63-258, by the National Academy of Sciences.

In particular embodiments, the flavour co-ingredient is selected from the compounds and compositions disclosed in WO2005102701, WO2006009425, WO2005096843, WO2006046853 and WO2005096844, all of which references are herein incorporated by reference in their entirety.

Flavour co-ingredients may include known salt tastants, umami tastants, and savoury flavour compounds. Non limiting examples include: NaCl, KCl, MSG, guanosine monophosphate (GMP), inosin monophospahte (IMP), ribonucleotides such as disodium inosinate, disodium guanylate, N-(2-hydroxyethyl)-lactamide, N-lactoyl-GMP, N-lactoyl tyramine, gamma amino butyric acid, allyl cysteine, 1-(2-hydroxy-4-methoxylphenyl)-3-(pyridine-2-yl)propan-1-one, arginine, potassium chloride, ammonium chloride, succinic acid, N-(2-methoxy-4-methyl benzyl)-N′-(2-(pyridin-2-yl)ethyl) oxalamide, N-(heptan-4-yl)benzo(D)(1,3)dioxole-5-carboxamide, N-(2,4-dimethoxybenzyl)-N′-(2-(pyridin-2-yl)ethyl) oxalamide, N-(2-methoxy-4-methyl benzyl)-N′-2(2-(5-methyl pyridin-2-yl)ethyl) oxalamide, cyclopropyl-E,Z-2,6-nonadienamide.

The carrier material may be employed in compositions according to the present disclosure to encapsulate or to entrap in a matrix the other components of the composition. The role of the carrier material may be merely that of a processing aid or a bulking agent, or it might be employed to shield or protect the other components from the effects of moisture or oxygen or any other aggressive media. The carrier material might also act as a means of controlling the release of flavour from edible compositions.

Carrier materials may include mono, di- or trisaccharides, natural or modified starches, hydrocolloids, cellulose derivatives, polyvinyl acetates, polyvinylalcohols, proteins or pectins. Example of particular carrier materials include sucrose, glucose, lactose, levulose, fructose, maltose, ribose, dextrose, isomalt, sorbitol, mannitol, xylitol, lactitol, maltitol, pentatol, arabinose, pentose, xylose, galactose, maltodextrin, dextrin, chemically modified starch, hydrogenated starch hydrolysate, succinylated or hydrolysed starch, agar, carrageenan, gum arabic, gum accacia, tragacanth, alginates, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropylmethyl cellulose, derivatives and mixtures thereof. Of course, one skilled in the art will appreciate that the cited materials are hereby given by way of example and are not to be interpreted as limiting the present subject matter.

By “flavour adjuvant” is meant an ingredient capable of imparting additional added benefit to compositions of the present disclosure such as a colour, light resistance, chemical stability and the like. Suitable adjuvants include solvents (including water, alcohol, ethanol, triacetine, oils, fats, vegetable oil and miglyol), binders, diluents, disintegrating agents, lubricants, colouring agents, preservatives, antioxidants, emulsifiers, stabilisers, anti-caking agents, and the like. In a particular embodiment, the flavour composition comprises an anti-oxidant. Said anti-oxidants may include vitamin C, vitamin E, rosemary extract, antrancine, butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT).

Examples of such carriers or adjuvants for flavour compositions may be found in for example, “Perfume and Flavour Materials of Natural Origin”, S. Arctander, Ed., Elizabeth, N.J., 1960; in “Perfume and Flavour Chemicals”, S. Arctander, Ed., Vol. I & II, Allured Publishing Corporation, Carol Stream, USA, 1994; in “Flavourings”, E. Ziegler and H. Ziegler (ed.), Wiley-VCH Weinheim, 1998, and “CTFA Cosmetic Ingredient Handbook”, J. M. Nikitakis (ed.), 1st ed., The Cosmetic, Toiletry and Fragrance Association, Inc., Washington, 1988.

Other suitable and desirable ingredients of flavour compositions are described in standard texts, such as “Handbook of Industrial Chemical Additives”, ed. M. and I. Ash, 2^(nd) Ed., (Synapse 2000).

Flavour compositions according to the present disclosure may be provided in any suitable physical form. For example, they may be in the form of oils, emulsions or dispersions in a hydrous liquid or organic liquid suitable for use in edible compositions, or solid form, such as powders.

If the flavour compositions are to be provided in the form of a powdered composition, they may be prepared by dispersive evaporation techniques generally known in the art, such as spray drying.

Accordingly, in another aspect, there is provided a method of forming a powder composition, comprising the steps of providing a liquid composition comprising a sulfoxide compound of the formula (I) and one or more optional ingredients selected from at least one flavour co-ingredient, a carrier material and an adjuvant, and dispersively evaporating said liquid composition to form a powder composition.

In this manner, a sulfoxide compound of formula (I) or a flavour composition comprising said compound may be presented in a powder form.

The liquid composition used in the preparation of a powder may be in the form of a solution, emulsion, dispersion or slurry. The liquid may contain water, and/or an organic liquid, such as ethanol, glycerol, triacetine, miglyol (MCT) that is acceptable for use in edible compositions.

In another embodiment, powder compositions may be prepared according to methods and apparatus known in the art for producing powders on an industrial scale. A particularly suitable method is spray drying. Spray drying techniques and apparatus are well known in the art and need no detailed discussion herein. The spray drying techniques, apparatus and methods described in US2005/0031769 and US2013/0022728, as well as those techniques, apparatus and methods described in those documents are suitable for producing powder compositions of the present disclosure and are herein incorporated by reference in their entirety.

The manner in which the sulfoxide compounds of formula (I) are incorporated into powder flavour compositions is not critical. For example, the compounds may be added to the liquid composition described above and be subjected to a dispersive evaporation process along with all the other components of the flavour composition. Alternatively, compounds may be added to the flavour composition after it has been formed as a powder.

Many of the flavour co-ingredients described herein above are volatile and/or may be sensitive to oxidative degradation, particularly when subjected to elevated temperature, and under humid conditions. Accordingly, particular problems can arise when subjecting flavour co-ingredients described above to dispersive evaporation processes such as spray drying. A non-exhaustive list of ingredients that can be particularly susceptible include, those ingredients containing artificial, natural or synthetic fruit flavours such as vanilla, chocolate, coffee, cocoa and citrus oil, including lemon, orange, grape, lime and grapefruit, and fruit essences including apple, pear, peach, strawberry, raspberry, cherry, plum, pineapple, apricot and the like. The volatile components of these flavour co-ingredients may include, but are not limited to, acetaldehyde, dimethyl sulfide, ethyl acetate, ethyl propionate, methyl butyrate, and ethyl butyrate. Flavour co-ingredients containing volatile aldehydes or esters include, e.g., cinnamyl acetate, cinnamaldehyde, citral, diethylacetal, dihydrocarvyl acetate, eugenyl formate, and p-methylanisole. Further examples of volatile compounds that may be present as co-ingredients include acetaldehyde (apple); benzaldehyde (cherry, almond); cinnamic aldehyde (cinnamon); citral, i.e., alpha citral (lemon, lime); neral, i.e., beta citral (lemon, lime); decanal (orange, lemon); ethyl vanillin (vanilla, cream); heliotropine, i.e., piperonal (vanilla, cream); vanillin (vanilla, cream); alpha-amyl cinnamaldehyde (spicy fruity flavors); butyraldehyde (butter, cheese); valeraldehyde (butter, cheese); citronellal (modifies, many types); decanal (citrus fruits); aldehyde C-8 (citrus fruits); aldehyde C-9 (citrus fruits); aldehyde C-12 (citrus fruits); 2-ethyl butyraldehyde (berry fruits); hexenal, i.e., trans-2 (berry fruits); tolyl aldehyde (cherry, almond); veratraldehyde (vanilla); 2,6-dimethyl-5-heptenal, i.e., melonal (melon); 2-6-dimethyloctanal (green fruit); and 2-dodecenal (citrus, mandarin); cherry; or grape and mixtures thereof.

Applicant surprisingly found that the inclusion of a sulfoxide compound of formula (I) in a powder flavour composition, it was possible to maintain the flavour quality of flavour composition converted into powdered form by a dispersive evaporation process.

Accordingly, there is provided in another aspect of the present disclosure a method of maintaining flavour quality of a powder flavour composition comprising the step of including in said powder flavour composition a sulfoxide compound of formula (I).

As stated hereinabove, compounds of formula (I) or flavour compositions containing such sulfoxide compounds can be incorporated into edible compositions, and an edible composition containing such a compound or flavour composition forms another aspect of the present disclosure.

The term “edible composition” refers to products for consumption by a subject, typically via the oral cavity (although consumption may occur via non-oral means such as inhalation), for at least one of the purposes of enjoyment, nourishment, or health and wellness benefits. Edible compositions may be present in any form including, but not limited to, liquids, solids, semi-solids, tablets, capsules, lozenges, strips, powders, gels, gums, pastes, slurries, syrups, aerosols and sprays. The term also refers to, for example, dietary and nutritional supplements. Edible compositions include compositions that are placed within the oral cavity for a period of time before being discarded but not swallowed. It may be placed in the mouth before being consumed, or it may be held in the mouth for a period of time before being discarded. An edible composition as herein above defined includes compositions whose taste is modified in the manner described herein by the addition of sulfoxide compounds of formula (I) or whose taste is so modified by processing such that it is enriched in a sulfoxide compound of formula (I).

In a particular embodiment the term “edible compositions” refers to products for consumption by a subject, typically via the oral cavity (although consumption may occur via non-oral means such as inhalation), for one of the purposes of enjoyment or nourishment.

In a more particular embodiment the term “edible compositions” refers to products for consumption by a subject, typically via the oral cavity (although consumption may occur via non-oral means such as inhalation), for the purpose of enjoyment. Still more particularly, the term refers to foodstuffs and beverages.

In a particular embodiment, the term “edible composition” does not relate to pharmaceutical compositions.

In another embodiment, the term “edible composition” does not relate to nutritional supplements.

Broadly, the edible composition includes, but is not limited to foodstuffs of all kinds, confectionery products, baked products, sweet products, savoury products, fermented products, dairy products, beverages and oral care products.

Exemplary foodstuffs include, but are not limited to, chilled snacks, sweet and savoury snacks, fruit snacks, chips/crisps, extruded snacks, tortilla/corn chips, popcorn, pretzels, nuts, other sweet and savoury snacks, snack bars, granola bars, breakfast bars, energy bars, fruit bars, other snack bars, meal replacement products, slimming products, convalescence drinks, ready meals, canned ready meals, frozen ready meals, dried ready meals, chilled ready meals, dinner mixes, frozen pizza, chilled pizza, soup, canned soup, dehydrated soup, instant soup, chilled soup, uht soup, frozen soup, pasta, canned pasta, dried pasta, chilled/fresh pasta, noodles, plain noodles, instant noodles, cups/bowl instant noodles, pouch instant noodles, chilled noodles, snack noodles, dried food, dessert mixes, sauces, dressings and condiments, herbs and spices, spreads, jams and preserves, honey, chocolate spreads, nut-based spreads, and yeast-based spreads.

Exemplary confectionery products include, but are not limited to, chewing gum (which includes sugarized gum, sugar-free gum, functional gum and bubble gum), centerfill confections, chocolate and other chocolate confectionery, medicated confectionery, lozenges, tablets, pastilles, mints, standard mints, power mints, chewy candies, hard candies, boiled candies, breath and other oral care films or strips, candy canes, lollipops, gummies, jellies, fudge, caramel, hard and soft panned goods, toffee, taffy, liquorice, gelatin candies, gum drops, jelly beans, nougats, fondants, combinations of one or more of the above, and edible flavour compositions incorporating one or more of the above.

Exemplary baked products include, but are not limited to, alfajores, bread, packaged/industrial bread, unpackaged/artisanal bread, pastries, cakes, packaged/industrial cakes, unpackaged/artisanal cakes, cookies, chocolate coated biscuits, sandwich biscuits, filled biscuits, savoury biscuits and crackers, bread substitutes,

Exemplary sweet products include, but are not limited to, breakfast cereals, ready-to-eat (“rte”) cereals, family breakfast cereals, flakes, muesli, other ready to eat cereals, children's breakfast cereals, hot cereals,

Exemplary savoury products include, but are not limited to, salty snacks (potato chips, crisps, nuts, tortilla-tostada, pretzels, cheese snacks, corn snacks, potato-snacks, ready-to-eat popcorn, microwaveable popcorn, pork rinds, nuts, crackers, cracker snacks, breakfast cereals, meats, aspic, cured meats (ham, bacon), luncheon/breakfast meats (hotdogs, cold cuts, sausage), tomato products, margarine, peanut butter, soup (clear, canned, cream, instant, UHT), canned vegetables, pasta sauces.

Exemplary dairy products include, but are not limited to, cheese, cheese sauces, cheese-based products, ice cream, impulse ice cream, single portion dairy ice cream, single portion water ice cream, multi-pack dairy ice cream, multi-pack water ice cream, take-home ice cream, take-home dairy ice cream, ice cream desserts, bulk ice cream, take-home water ice cream, frozen yoghurt, artisanal ice cream, dairy products, milk, fresh/pasteurized milk, full fat fresh/pasteurized milk, semi skimmed fresh/pasteurized milk, long-life/uht milk, full fat long life/uht milk, semi skimmed long life/uht milk, fat-free long life/uht milk, goat milk, condensed/evaporated milk, plain condensed/evaporated milk, flavoured, functional and other condensed milk, flavoured milk drinks, dairy only flavoured milk drinks, flavoured milk drinks with fruit juice, soy milk, sour milk drinks, fermented dairy drinks, coffee whiteners, powder milk, flavoured powder milk drinks, cream, yoghurt, plain/natural yoghurt, flavoured yoghurt, fruited yoghurt, probiotic yoghurt, drinking yoghurt, regular drinking yoghurt, probiotic drinking yoghurt, chilled and shelf-stable desserts, dairy-based desserts, soy-based desserts.

Exemplary beverages include, but are not limited to, flavoured water, soft drinks, fruit drinks, coffee-based drinks, tea-based drinks, juice-based drinks (includes fruit and vegetable), milk-based drinks, gel drinks, carbonated or non-carbonated drinks, powdered drinks, alcoholic or non-alcoholic drinks.

Exemplary fermented foods include, but are not limited to, cheese and cheese products, meat and meat products, soy and soy products, fish and fish products, grain and grain products, fruit and fruit products.

In a particular embodiment the consumable product is selected from the group consisting of soy sauce, cheese, soup, hot and cold sauces, fruits, vegetables, ketchups, tea, coffee, snacks such as potato chips or extruded snacks.

The sulfoxide compounds of formula (I), when added to a flavour composition and/or an edible composition act on the composition to complement its flavour and/or mouthfeel to render it more delicious and authentic. The effects may be temporal or related to intensity, for example the compounds may act by enhancing, strengthening, softening, sharpening a flavour, or making more salivating. The sulfoxide compounds of formula (I) may also affect the temporal profile of a flavour, that is, they may affect the initial impact of a flavour, the body of a flavour, or its lingering effect.

The sulfoxide compounds of formula (I) may modify any aspect of the temporal profile of taste or flavour of an edible composition. In particular, the compounds improve mouthfeel and impart more creamy and fatty sensations.

Sulfoxide compounds of formula (I) or flavour compositions containing same may be added to edible compositions in widely varying amounts. The amount will depend on the nature of the edible composition to be flavoured, and on the desired effect, as well as on the nature of the ingredients present in said flavour composition. In order to obtain the remarkable beneficial effects attributed to the presence of the sulfoxide compounds of formula (I), the flavour composition should be employed in amounts such that the sulfoxide compounds of formula (I) are present in amounts of 1 part per billion to 10 parts per million based on the total weight of the edible composition. Whereas amounts higher than this can be employed, the beneficial effects are considerably less apparent and undesirable off-notes can become increasingly apparent.

Interesting organoleptic effects, e.g. salt, alcohol or coolant boosting effects, in edible compositions containing salt or alcohol or coolant compounds can be achieved when sulfoxide compounds of the formula (I) are employed at levels of 1 to 100 ppb.

Interesting organoleptic effects, for example umami boosting effects, in edible compositions containing umami tastants can be achieved when sulfoxide compounds of the formula (I) are employed at levels of 100 to 250 ppb.

Interesting organoleptic effects, in particular mouthfeel boosting effects, in edible compositions can be achieved when sulfoxide compounds of the formula (I) are employed at levels of 250 to 500 ppb.

Interesting organoleptic effects, e.g. fat boosting effects, in edible compositions containing fats can be achieved when sulfoxide compounds of the formula (I) are employed at levels of 500 to 1000 ppb.

It is particularly advantageous to incorporate sulfoxide compounds of formula (I) into edible compositions that are formed under conditions of high temperature, such as baking, frying or which are processed by heat treatments such as pasteurization or under UHT conditions. Under high preparation or processing temperatures, volatile flavour ingredients may be lost or degraded with the result that flavour intensity can be reduced and the essential and authentic flavour characteristics can be diminished. Such edible products include dairy products, snack foods, baked products, powdered soft drinks and similar dry mixes, and the like, fats and condiments, mayonnaise, dressings, soups and bouillons, and beverages.

In another embodiment, edible compositions according to the present disclosure are powdered soft drinks and similar dry mix applications. Dry mix applications are known in the art and included products in powder form that are intended to be reconstituted before consumption. They include powdered soups, powdered cake mixes, powdered chocolate drinks, instant coffees, seasonings and fonds, and the like.

Dry powders formed by dispersive evaporation processes, such as spray drying, represent a very convenient vehicle to deliver flavour oil quality flavours to edible compositions.

Unfortunately, flavour oils, and in particular citrus flavour oils can be particularly sensitive to dispersive evaporation processes, especially processes carried out at high temperature. Flavour oils tend to evaporate or degrade to form products having unfavourable off-notes. Powdered flavour compositions, particularly those containing citrus oils, can be of poor quality and exhibit relatively short self-life, as a result.

Surprisingly, the incorporation of sulfoxide compounds of formula (I) or flavour compositions containing same into powder compositions, results in powder compositions that exhibit the impact and authenticity of the flavour oils used in their preparation, essentially maintaining flavour oil quality in a powdered flavour formulations.

Accordingly, in another aspect a powder flavour composition comprising a sulfoxide compound according to formula (I) and at least one additional flavour co-ingredient is provided.

In another aspect of the present disclosure there is provided a powder soft drink composition or other dry mix composition comprising a sulfoxide compound according to formula (I).

In yet another aspect of the present disclosure there is provided a powder soft drink composition or other dry mix composition comprising a powder flavour composition comprising a sulfoxide compound of formula (I).

In yet another aspect, there is provided a method of forming a powder flavour composition comprising the step of incorporating into said composition a sulfoxide compound according to formula (I).

In one embodiment, the sulfoxide compound of formula (I) may be added to the formed powder flavour composition, or it may be added to flavour composition before forming the powder.

In another embodiment, snack foods are a class of edible composition according to the present disclosure. Snack foods are a category of product well known to the skilled person in the food industry. These products are described above and include, without limitation, pretzels, corn chips, potato chips, puffed products, extruded products, tortilla chips and the like. Still more particularly, the present disclosure is concerned with low fat snack food compositions. Low fat snack food compositions contain less than 30% by weight fat, more particularly between 5 to 25% by weight of fat.

A problem with reducing fat in a snack food composition is the loss in taste and texture. Fats play an important role in the way that dough behaves during processing and greatly affect the quality, flavor and texture of ready-to-eat products. As the fat content in snack products is reduced or replaced with other ingredients (e.g., non-digestible fat, protein, fiber, gums), adverse organoleptic effects (e.g., mouth coating, drying, lack of crispness and lack of flavour) are increased. The adverse organoleptic effects result in products having reduced palatability.

Considerable efforts have been expended in devising flavour compositions to overcome the problems associated with low fat snack food products. Flavours may be applied to a snack food as topical coatings in the form of dry powders and/or as liquids (e.g., oil-based, water-based). Another approach has been to add flavour to the dough.

Despite these various approaches which have been taken to improve consumer appeal and palatability of snack foods, and particularly low fat snack foods, there is still a need for improved low-fat snack foods having coatings applied thereto with the visual appeal, flavor, and texture of full-fat snack foods.

Sulfoxide compounds according to formula (I) or flavour compositions containing same can be incorporated into snack foods to impart an impactful flavour and a mouthfeel with a remarkable roundness and fullness. Furthermore, the taste and mouthfeel effects can be achieved even in low fat snack foods.

Accordingly, the present disclosure provides in another of its aspects a snack food comprising a flavour composition as hereinabove described. In one embodiment, the snack food has a fat content of about 40% or less by weight based on the total weight of the snack food, more particularly about 30% or less, still more particularly 25% or less, more particularly still about 10% or less, still more particularly about 5% or less, still more particularly about 3% or less.

Examples of snack foods are described above and include products processed by oven baking, extrusion or frying, and which are made from potato and/or corn and/or various grains such as rice or wheat.

Another particularly preferred class of edible composition according to the present disclosure is alcoholic beverages.

Applicant surprisingly found that compounds according to formula (I) incorporated into an alcoholic beverage had the effect of increasing the alcohol impact of the beverage.

Accordingly, there is provided in another aspect of the present disclosure an alcoholic beverage comprising a compound according to formula (I).

In yet another aspect of the present disclosure there is provided a method of producing a heightened alcoholic impression in an alcoholic beverage by incorporating into said beverage a compound according to formula (I).

Compounds of formula (I) may be incorporated into said alcoholic beverage in amounts of 1 ppb to 1 ppm.

Another preferred class of edible compositions are products ingested in the form of tablets, capsules, powders, multiparticulates and the like, which may include pharmaceuticals and nutraceuticals.

Certain groups of people have problems swallowing tablets or capsules, powders, multiparticulates and the like. This problem can be particularly pronounced in certain consumer groups, such as children and the very old or infirm. Applicant surprisingly found that compounds according to the formula (I) when taken into the oral cavity produce a pronounced salivating effect. Incorporating the compounds into these dosage forms, particularly as part of a coating around said dosage forms can ease the swallowing process for consumers, in particular children and the old or infirm.

Accordingly, there is provided in another aspect of the present disclosure an orally administrable dosage form, in particular in the form of tablets capsules, powders or multiparticulates comprising a compound according to the formula (I).

Another preferred class of edible composition is baked goods. Compounds of the formula (I) may be incorporated topically or in-dough. Incorporated at levels of 1 ppb to 1 ppm, the compounds of formula (I) render baked products less dry and more succulent.

Other preferred class of edible compositions are caloric or non-caloric beverages containing carbohydrate sweeteners, such as sucrose, high fructose corn syrup, fructose and glucose, or high intensity, non-nutritive sweeteners such as aspartame, acesulfame K, sucralose, cyclamate, sodium saccharin, neotame, rebaudioside A, and/or other stevia-based sweeteners; as well as other optional ingredients such as juices, organic acids such as citric acid, alcohol and functional ingredients.

Incorporated at levels of 1 ppb to 10 ppm, compounds of formula (I) impart to said beverages containing sweeteners at levels of less than 1% and up to about 20%, an upfront sweetness and mouthfeel that is reminiscent of sugar.

Other preferred edible compositions are savoury compositions, in particular those that are soy-based or fish-based.

Incorporated at levels of 1 ppb to 10 ppm, in a soy-based composition (such as soy sauce) or a fish-based composition (such as fish sauce) containing 5 to 40% salt, the compositions are found to exhibit strong umami tastes that are long-lasting and rich.

Another preferred edible composition is a clouded beverage composition.

Certain beverages such as juices have relatively higher turbidity and thus have an opaque appearance. Often, it is desired that the beverage have a relatively high turbidity. This might be desirable to provide a more natural appearance to beverages with low juice content, or it might be for reasons related to masking sedimentation or “ringing” (where flavour or colour oils rise to the surface of a container during storage). Clouded beverages are usually formed by means of a clouding agent. Clouding agents are usually supplied in the form of emulsions, or the clouding agent may be part of a powdered beverage that upon reconstitution will formed an emulsion providing a permanent cloud to the beverage.

Compounds of the formula (I), in addition to their remarkable organoleptic properties, can lend stability to clouding agents and to beverage compositions containing same.

Accordingly, there is provided in another aspect of the present disclosure a composition comprising a beverage clouding composition and a compound of formula (I).

In a particular embodiment of the present disclosure, a flavour composition as herein defined may be provided in the form of an emulsion. This emulsion composition may be particularly useful in clouded beverage applications, in particular, in which it is intended to employ a clouding agent.

In yet another aspect of the present disclosure there is provided a clouded beverage composition comprising a clouding agent and a compound of the formula (I).

Other preferred edible compositions are those compositions that are formed by a process of ripening.

In food processing, it frequently occurs that a food needs to remain for a prolonged period of time and under well-defined conditions to obtain the food with the requisite and recognised quality. A commonly used term for this process is ripening. Ripening is well known in the processing of certain types of cheese, meat, soy-sauce and wine, as well as beer sausage, sauerkraut, tempeh and tofu. There are also specific steps that are carried out for specific reasons (such as water-removal, or off-note removal) that have beneficial effects on the food products. Examples of this are the conching of chocolate and the drying of noodles, vegetables and fruits. The transformations that improve the quality of the food are induced by chemical conversions, enzymatically catalysed conversions or fermentative transformations. All of these conversions are slow and therefore expensive; they are also not fully predictable or controllable.

The compounds of formula (I), having regard to their remarkable property of adding to the authentic taste characteristics of the edible compositions in which they are incorporated, may be added to an edible product during its ripening process in order to reduce storage time without adversely influencing the taste quality of the ripened product.

Accordingly, in another aspect of the present disclosure there is provided a method of ripening a product selected from the group consisting of cheese, meat, soy-sauce and wine, beer, sausage, sauerkraut, tempeh and tofu, comprising the step of ripening the product in the presence of a compound according to the formula (I).

In another aspect of the present disclosure there is provided a method of conching chocolate, said method comprising the step of adding to the chocolate a compound according to the formula (I), or a flavour composition containing same.

There now follows a series of illustrative, non-limiting examples.

SYNTHESIS EXAMPLES

1. General Structure

R¹=is a straight chain hydrocarbon group having 2 to 18 carbon atoms and containing zero to three double bonds or R¹ is a [(1E)-2,6-dimethylhepta-1,5-dien-1-yl]-group. Several compounds belonging to that general formula have been synthesized according to one of the 2 procedure described below. 2. Synthesis 2.1 Route A: (Acid Chloride Method) General Procedure for Making Amide A:

To a solution of methionine sulfoxide (0.6 g, 3.63 mmol) in 1:1 THF: 1N NaOH (20 ml:20 ml) at room temperature was added oleoyl chloride (1.1 g, 3.66 mmol) dropwise. The reaction was then stirred at room temperature for 7 hours. THF was removed under vacuum. Concentrated HCl was added to adjust the pH to 2. The aqueous layer was then extracted with EtOA_(c)3X and the organic layers were combined. The combined organic layer was washed with water, brine, dried (Na₂SO₄) and concentrated. The residue was chromatographed on silica gel (5% MeOH/DCM, 0.1% formic acid) to give 0.56 g (34.1%) of the product as a white solid.

2.2 Route B (DCC Method)

To a solution of (z)-dodec-5-enoic acid (5.04 mmol) with 1-hydroxypyrrolidine-2,5-dione (7.56 mmol) in THF (30 ml) was added DCC (7.77 mmol) at 0° C. The mixture was stirred at room temperature overnight. The formed solids (dicyclohexylurea) were removed by filtration and the filtrate was added to a solution of 2-amino-4-(methylsulfinyl) butanoic acid (6.05 mmol) and potassium carbonate (6.08 mmol) in water (30 ml) at room temperature. The mixture was stirred at room temperature for 7 hours. THF was evaporated under vacuum and the aqueous residue was acidified with conc. HCl to pH of 2. The aqueous layer was then extracted with EtOA_(c)3X and the organic layers were combined. The combined organic layer was washed with water, brine, dried (Na₂SO₄) and concentrated. The residue was chromatographed on silica gel (5% MeOH/DCM, 0.1% formic acid) to give 0.81 g (36.8%) of clear oil as product.

2.3 All Synthesized Compounds

TABLE 1 List of synthesized compounds Amino Carboxylic Structure acid acid Structure Route 1 Methionine sulfoxide C2:0

A 2 Methionine sulfoxide C6:0

A 3 Methionine sulfoxide C10:0

A 4 Methionine sulfoxide C12:1

A 5 Methionine sulfoxide C12:0

A 6 Methionine sulfoxide C14:0

A 7 Methionine sulfoxide C15:0

8 Methionine sulfoxide C16:0

9 Methionine sulfoxide C17:0

10 Methionine sulfoxide C18:2

11 Methionine sulfoxide C18:1

12 Methionine sulfoxide C18:0

3. NMR Data (Examples) 3.1 Structure 3 Met-SO C12:1

(2S)-2-((Z)-dodec-5-enamido)-4-(methylsulfinyl)butanoic acid: 36.8% yield;

¹H NMR (300 MHz, CD₃OD) δ ppm 0.90 (t, J=7.5 Hz, 3H), 1.24-1.40 (m, 8H), 1.61-1.73 (q, J=6.6 Hz, 2H), 2.01-2.17 (m, 5H), 2.27 (t, J=5.7 Hz, 2H), 2.30-2.44 (m, 1H), 2.65 (s, 3H), 2.75-2.99 (m, 2H), 4.50-4.58 (m, 1H), 5.32-5.45 (m, 2H).

¹³C NMR (300 MHz, CD₃OD) δ ppm 12.94, 22.19, 24.34, 24.49, 25.40, 25.42, 26.22, 26.70, 28.55, 29.31, 31.42, 34.87, 36.67, 49.71, 49.77, 50.88, 51.13, 128.26, 130.31, 172.58, 174.71, 174.77.

3.2 Structure 5 Met-SO C18:1

(2S)-4-(methylsulfinyl)-2-oleamidobutanoic acid: 34.1% yield;

¹H NMR (300 MHz, CD₃OD) δ ppm 0.88 (t, J=8.1 Hz, 3H), 1.28-1.33 (m, 20H), 1.56-1.67 (q, J=8.7 Hz, 2H), 2.03-2.17 (m, 5H), 2.25 (t, J=6.3 Hz, 2H), 2.31-2.41 (m, 1H), 2.63 (s, 3H), 2.72-2.97 (m, 2H), 4.50-4.57 (m, 1H), 5.28-5.39 (m, 2H).

¹³C NMR (300 MHz, CD₃OD) δ ppm 12.96, 22.24, 24.37, 24.45, 25.34, 25.36, 26.64, 26.66, 28.76, 28.80, 28.85, 28.87, 28.94, 29.11, 29.35, 31.56, 35.34, 36.69, 49.75, 49.83, 50.89, 51.15, 129.32, 129.38, 172.66, 174.91, 174.97.

In accordance with another embodiment, the applicant has now found that a S-Methylcysteine sulfoxide connected to a fatty acid residue through an amide bond may be employed as flavour ingredients that complement or accentuate the taste and mouthfeel characteristics of edible compositions into which they are incorporated across a wide category of flavour applications.

The present disclosure provides in a first aspect compounds of formula (II)

their edible salts, and their use in edible compositions wherein R₁ is an alkyl residue containing 2 to 18 carbon atoms, or an alkene residue containing from 9 to 25 carbon atoms with 1 to 6 double bonds, R₁ together with the carbonyl group to which it is attached is a residue of a carboxylic acid.

In one embodiment, a compound of the formula (II) is (2S)-3-(methylsulfinyl)-2-oleamidopropanoic acid synthesized according to Route A described above and having the structure:

The sulfoxide compounds of formula (II) impart remarkable organoleptic properties to edible compositions to which they are added. In particular, they impart highly intense, authentic and harmonious flavour, and a roundness and fullness to edible compositions containing them.

More particularly, the compounds can be incorporated into an edible product to impart a remarkable mouthfeel, body and enhanced fat perception; or an enhanced umami or salt taste. They are particularly useful in applications low in fat, salt and umami.

This finding was all the more surprising considering that when applicant tasted the compounds in dilute aqueous solution, they were either tasteless or they exhibited a disappointing, faintly fatty taste profile. As such, they appeared to be quite unsuitable for use in flavour applications. Only their combination with flavour co-ingredients and the judicious selection of their usage levels was it possible to discover the remarkable organoleptic properties of these compounds. Their effect on edible compositions is quite unusual in that rather than exerting a characteristic flavour profile to a foodstuff or a beverage, they actually complement, lift or accentuate the essential or authentic flavour and mouth feel characteristics of the foods or beverages in which they are incorporated. Accordingly, the compounds of the present disclosure find utility in a broad spectrum of applications in the food and beverage industry, as well as in health and wellness.

Accordingly, in one embodiment, a method of conferring flavour and/or mouthfeel to, or improving taste and/or mouthfeel of an edible composition, which method comprises adding to said composition a sulfoxide compound of formula (II) defined herein.

The remarkable organoleptic effects are observed when the sulfoxide compounds of formula (II) are incorporated into an edible composition containing one or more flavour co-ingredients.

The flavour co-ingredients may be sugars, fats, salt (e.g. sodium chloride), MSG, calcium ions, phosphate ions, organic acids, proteins, purines and mixtures thereof.

APPLICATION EXAMPLES

Testing with Methionine Sulfoxide Derivatives

Samples were evaluated by expert tasters. Tasters were asked to describe the samples focusing on authentic taste, mouthfeel, fullness, salty-ness, salivation, umami, sweetness, juiciness, richness, long lastingness and fattiness

Comparison in a Cheese Onion Crisp

Base is a crisp with proprietary cheese onion powder flavoring @ 6%

Base plus Met-SO C18:1 at 10 ppb: salt/taste level enhanced; onion character more fried

Comparison in Onion Soup

Base is Campbell's® French onion soup

Base plus Met-SO C18:1 at 10 ppb: slightly stronger in salt; onion character slightly enhanced

Comparison in Onion Soup

Base is UNOX ‘Franse uiensoep’

Base plus Met-SO C18:1 at 10 ppb: slightly stronger in salt; onion character increased

APPLICATION EXAMPLES

Testing with S-Methylcysteine Sulfoxide Derivative

Samples were evaluated by expert tasters. Tasters were asked to describe the samples focusing on authentic taste, mouthfeel, fullness, salty-ness, salivation, umami, sweetness, juiciness, richness, long lastingness and fattiness.

Comparison in a Cheese Sauce

Base is a Maggie Saus Base with 0.05 g ethanol

Base plus (2S)-3-(methylsulfinyl)-2-oleamidopropanoic acid at 0.5 ppm: salt/umami/fullness/cheesiness level enhanced.

Samples were evaluated by expert tasters. Tasters were asked to describe the samples focusing on authentic taste, mouthfeel, fullness, salty-ness, salivation, umami, sweetness, juiciness, richness, long lastingness and fattiness.

The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm”.

While particular embodiments have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention. 

What is claimed is:
 1. A stock solution comprising 0.01 to 1% by weight of a compound of formula (I) corresponding to the formula

wherein R₁ is an alkyl residue containing 2 to 18 carbon atoms, or an alkene residue containing from 9 to 25 carbon atoms with 1 to 6 double bonds, R₁ together with the carbonyl group to which it is attached is a residue of a carboxylic acid, wherein the Met-SO residue of the compound of formula (I) is selected from the group consisting of: N-geranoyl-Met, N-palmitoyl-Met, N-palmitenoyl-Met, N-oleoyl-Met, N-stearoyl-Met, N-linoleoyl-Met and N-linolenoyl-Met and wherein, the compound of formula (I) accentuates the taste or mouth feel characteristics of edible products in which it is incorporated when the sulfoxide compound is present at a level of from 1 part per billion to 10 parts per million in the edible product.
 2. The stock solution of claim 1 further comprising a carrier material.
 3. The stock solution of claim 2, wherein the carrier material comprises monosaccharides, disaccharides, trisaccharides, natural or modified starches, hydrocolloids, cellulose derivatives, polyvinyl acetates, polyvinylalcohols, proteins, pectins, or mixtures thereof.
 4. The stock solution of claim 2, wherein the carrier material comprises sucrose, glucose, lactose, levulose, fructose, maltose, ribose, dextrose, isomalt, sorbitol, mannitol, xylitol, lactitol, maltitol, pentatol, arabinose, pentose, xylose, galactose, maltodextrin, dextrin, chemically modified starch, hydrogenated starch hydrolysate, succinylated or hydrolysed starch, agar, carrageenan, gum arabic, gum accacia, tragacanth, alginates, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropylmethyl cellulose derivatives or mixtures thereof.
 5. The stock solution according to claim 1 further comprising an adjuvant.
 6. The stock solution according to claim 5, wherein the adjuvant comprises a solvent, binder, diluent, disintegrating agent, lubricant, colouring agent, preservative, antioxidant, emulsifier, stabiliser, anti-caking agent or mixtures thereof.
 7. The stock solution according to claim 6, wherein the solvent comprises water, alcohol, ethanol, triacetine, oils, fats, vegetable oil, miglyol, or mixtures thereof.
 8. The stock solution of claim 1 further comprising a solvent, wherein the solvent is selected from the group consisting of ethanol, triacetine, glycerol, miglyol and mixtures thereof.
 9. The stock solution according to claim 5, wherein the adjuvant comprises an antioxidant.
 10. The stock solution according to claim 9, wherein the antioxidant is present in an amount of about 10 ppm to about 1,000 ppm based on the total weight of the stock solution.
 11. The stock solution according to claim 9, wherein the antioxidant is selected from the group consisting of vitamin C, vitamin E, rosemary extract, antrancine, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and mixtures thereof. 